It's like summer and fall at the same time! These apple peach crumb bars are so good!
Preheat oven to 375 degrees F. Grease a 9x13 baking pan with butter.
In a large bowl, combine all ingredients for the apple peach filling. Mix until evenly combined and fruit is coated. Set aside.
In another large bowl, whisk flour, sugar, baking powder, cinnamon, lemon zest, and salt. Cut in the butter into the dry ingredients using a pastry blender until you get pea-sized crumbles. You can also rub in the flour and butter with your fingers, but do it quickly so that the butter doesn’t soften too much. Add the egg and mix until a very crumbly dough forms (it will seem dry).
Place half of the dough on the prepared 9x13 inch pan. Press down to form a firm and even layer. Spread the prepared peach and apple mixture evenly over dough, leaving most of the liquid behind. Spread out the remaining dough crumbles over the filling.
Bake for 45 minutes. Let cool completely. Cut into squares and serve.